You add one side of each of the equations to form one side of the new equation. You add the other sides of the equations to form the other side.
Subtraction is done similarly.
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You can use an abacus to add and subtract quantities of beads by moving the them around. This can in turn help to solve equations involving counting numbers.
The opposite of add is subtract.
You add or subtract only the numerators
By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract
Subtract.